# Properties

 Base field $$\Q(\sqrt{-2})$$ Label 2.0.8.1-20449.2-a1 Conductor $$(143)$$ Conductor norm $$20449$$ CM no base-change yes: 143.a1,9152.n1 Q-curve yes Torsion order $$1$$ Rank not available

# Related objects

Show commands for: Magma / SageMath / Pari/GP

## Base field $$\Q(\sqrt{-2})$$

Generator $$a$$, with minimal polynomial $$x^{2} + 2$$; class number $$1$$.

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![2, 0, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^2 + 2)
gp (2.8): K = nfinit(a^2 + 2);

## Weierstrass equation

$$y^2 + y = x^{3} - x^{2} - x - 2$$
magma: E := ChangeRing(EllipticCurve([0, -1, 1, -1, -2]),K);
sage: E = EllipticCurve(K, [0, -1, 1, -1, -2])
gp (2.8): E = ellinit([0, -1, 1, -1, -2],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 $$\mathfrak{N}$$ = $$(143)$$ = $$\left(a + 3\right) \cdot \left(a - 3\right) \cdot \left(13\right)$$ magma: Conductor(E); sage: E.conductor() $$N(\mathfrak{N})$$ = $$20449$$ = $$11^{2} \cdot 169$$ magma: Norm(Conductor(E)); sage: E.conductor().norm() $$\mathfrak{D}$$ = $$(1859)$$ = $$\left(a + 3\right) \cdot \left(a - 3\right) \cdot \left(13\right)^{2}$$ magma: Discriminant(E); sage: E.discriminant() gp (2.8): E.disc $$N(\mathfrak{D})$$ = $$3455881$$ = $$11^{2} \cdot 169^{2}$$ magma: Norm(Discriminant(E)); sage: E.discriminant().norm() gp (2.8): norm(E.disc) $$j$$ = $$-\frac{262144}{1859}$$ magma: jInvariant(E); sage: E.j_invariant() gp (2.8): E.j $$\text{End} (E)$$ = $$\Z$$ (no Complex Multiplication ) magma: HasComplexMultiplication(E); sage: E.has_cm(), E.cm_discriminant() $$\text{ST} (E)$$ = $\mathrm{SU}(2)$

## Mordell-Weil group

Rank not available.
magma: Rank(E);
sage: E.rank()
magma: Generators(E); // includes torsion
sage: E.gens()

Regulator: not available

magma: Regulator(Generators(E));
sage: E.regulator_of_points(E.gens())

## Torsion subgroup

Structure: Trivial magma: TorsionSubgroup(E); sage: E.torsion_subgroup().gens() gp (2.8): elltors(E)[2] magma: Order(TorsionSubgroup(E)); sage: E.torsion_order() gp (2.8): elltors(E)[1]

## Local data at primes of bad reduction

magma: LocalInformation(E);
sage: E.local_data()
prime Norm Tamagawa number Kodaira symbol Reduction type Root number ord($$\mathfrak{N}$$) ord($$\mathfrak{D}$$) ord$$(j)_{-}$$
$$\left(a + 3\right)$$ $$11$$ $$1$$ $$I_{1}$$ Non-split multiplicative $$1$$ $$1$$ $$1$$ $$1$$
$$\left(a - 3\right)$$ $$11$$ $$1$$ $$I_{1}$$ Non-split multiplicative $$1$$ $$1$$ $$1$$ $$1$$
$$\left(13\right)$$ $$169$$ $$2$$ $$I_{2}$$ Split multiplicative $$-1$$ $$1$$ $$2$$ $$2$$

## Galois Representations

The mod $$p$$ Galois Representation has maximal image for all primes $$p$$ .

## Isogenies and isogeny class

This curve has no rational isogenies. Its isogeny class 20449.2-a consists of this curve only.

## Base change

This curve is the base-change of elliptic curves 143.a1, 9152.n1, defined over $$\Q$$, so it is also a $$\Q$$-curve.